How can an array be sorted in ascending order in PHP?

In PHP, you can use the sort() function to sort an array in ascending order. Here is an example:

$numbers = array(5, 3, 8, 2, 1);
sort($numbers);

print_r($numbers);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 5
    [4] => 8
)

In the above example, the sort() function sorted the $numbers array, and then printed the sorted array using the print_r() function.